A milligram (mg) is a unit of mass in the metric system. It is equal to one thousandth of a gram (1 mg = 0.001 g). In comparison to other units of mass, 1 milligram is:

- Equal to 1000 micrograms (µg): 1 mg = 1000 µg

- Equal to 0.015432 grains (gr): 1 mg = 0.015432 gr

- Approximately equal to 0.000035274 ounces (oz): 1 mg ≈ 0.000035274 oz

- Approximately equal to 3.5274 x 10^-8 pounds (lb): 1 mg ≈ 3.5274 x 10^-8 lb

To put the weight of a milligram into perspective, consider the following examples:

- A standard paper clip weighs approximately 100 milligrams.

- A grain of sand weighs approximately 1 milligram.

- An average-sized aspirin tablet weighs approximately 325 milligrams.

- A United States one-dollar bill weighs approximately 1 gram, which is 1000 milligrams.